Does shaking your hand actually relieve pain?

[Fat Steve]

Why shake your hand? Why not fix the improper technique that caused the pain in the first place?

In my case, I shake to aid with circulation and to relieve numbing from a nagging nerve injury from days long past. I can't fix the past, which is why I shake my hand.

 

[Jensby design]

I do stretch/warm up my hands only and no other bodyparts

Stretching your shoulders will increase circulation in your whole arm

 

[raphaeld]

Why shake your hand? Why not fix the improper technique that caused the pain in the first place?

Whenever there is intense muscle exercises (or movement) there will be pain. The same happen when I ride my moutain/road bike after 4 or 6 hours ride pain will occur no matter how good my technique is.
Therefore, shaking hands/arms/whatever will ease on your muscles.